CRP and infection: In comparison, the mean increase in CRP levels for viral mono-infections, bacterial mono-infections, and bacterial-viral co-infections was only twofold: 20.4 ± 32.5 mg/L (p = 0.013), 20.8 ± 26 mg/L (p = 0.017), and 21.9 ± 24.8 mg/L (p = 0.016), see Figure 5.